Fileseq

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* cpp - fix potential FileSequence memory leak during copy; switch to unique_ptr private data member
* cpp - use shared_ptr for internal map management instead of custom deleter
* cpp - clang-tidy formatting

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* go/cpp: fix regex to handle parsing complex extensions with single character component ("file.1.a.ext")
* go/cpp: improve handling of ambiguous frame patterns in FindSequenceOnDisk ("100.1.ext")
* go: remove print statement from FindSequenceOnDiskPad

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* cpp - Fix FrameSet::inverted() memory leak
* cpp - Fix framesToFrameRange() bad formatting with 2 frames

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* go/cpp - Implement UDIM style syntax for padding
* go/cpp - Fix parsing error by relaxing acceptable characters in extension component (align with pyfileseq)

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* go - Prevent single file path from being appended more than one FindSequences*
* go - Fix FindSequencesInList formatting bad sequence string for single-file sequence with ambiguous range-ish pattern
* go/cpp - Refactor FindSequences* to use optional frame range pattern when detecting single frame paths

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* Split the FindSequencesOnDisk logic to expose new FindSequencesInList function